Kamui (Gintama) punching Nobu Nobu so hard he sent the man flying out of the tower.

Bellcross' (Heroic Age) punches are powerful enough to shatter planets, vortexes and black holes, and can releases massive shock waves along the ground.

Naru Narusegawa (Love Hina) sends Keitaro flying with the Naru Punch.

Garon (Marchen Awakens Romance) is already gifted with superhuman strength. By combining his punches with his ÄRM for body hardening and ÄRM for strength enhancement, he can deliver an even more devastating blow.

...like so.

Kimihito Kurusu (Monster Musume) punches out the Racist Couple, sending them flying across the room.

Might Guy (Naruto) using Evening Elephant to punch five times at tremendous speed and force, each one progressively stronger, creating vacuums of devastating damage.